Crossbench senator John Madigan has criticised the Turnbull Government for denying anti-abortion speaker Troy Newman a visa while an application from controversial Dutch politician Geert Wilders was approved.

Fellow crossbench senator David Leyonhjelm also supported the rights of Mr Wilders and Mr Newman to travel to Australia.

There have been concerns that the Dutch politician's presence could incite increased anti-Islam sentiment in the wake of the fatal Parramatta shooting, but Senator Leyonhjelm said Mr Wilders would not be responsible for any action prompted by his appearance.

Moscow's words and actions — including the alleged poisoning of a former spy — are not the results of random aggression but rather fall into distinct patterns that can help us anticipate Russia's next moves under Vladimir Putin.